topic Re: Get center bar of a Rebar Layout in Revit API Forum

Get center bar of a Rebar Layout

Anonymous — Tue, 04 Jun 2019 13:53:44 GMT

Hi All,

I'm looking a way to get the center Rebar from a Rebar Layout (Maximum spacing). I need to get this element to get its Centerline to create a DetailLine in the same position.

Any thoughts?

Thanks in advance!

Re: Get center bar of a Rebar Layout

jeremytammik — Tue, 04 Jun 2019 14:00:45 GMT

I asked the development team for you...

Re: Get center bar of a Rebar Layout

Anonymous — Tue, 04 Jun 2019 14:11:49 GMT

Thanks @jeremytammik! I'll be very attent to hear from you.

Regards!

Re: Get center bar of a Rebar Layout

Anonymous — Tue, 04 Jun 2019 15:33:31 GMT

Hi @jeremytammik , by now I managed to do this:

double numBars = barra.NumberOfBarPositions;

                        double indice = 0;

                        // Si es Par
                        if (numBars % 2 == 0)
                        {
                            indice = (numBars / 2) - 1;
                        }

                        // Si es impar
                        else
                        {
                            indice = Math.Truncate(numBars / 2);
                        }

                        #endregion

                        #region SE CREAN LOS DETAIL LINES EN LA POSICION DE LA BARRA CENTRAL

                        if (numBars > 1)
                        {
                            IList<Curve> curva_patron = barra.GetCenterlineCurves(
                                true,
                                true,
                                true,
                                MultiplanarOption.IncludeOnlyPlanarCurves,
                                Convert.ToInt32(indice));

                            DetailCurve dc = doc.Create.NewDetailCurve(
                                doc.ActiveView,
                                curva_patron.First());

                            dc.LineStyle = fe_losa;
                        }

In my iteration, get the "indice" variable (index) as the number I want (the middle index), and using the GetCenterlineCurves with that index, I always get the first one and my detail line is created in this position.

What am I doing wrong?

Regards!

Re: Get center bar of a Rebar Layout

jeremytammik — Thu, 06 Jun 2019 06:29:47 GMT

Dear Jorge,

Thank you for your update and congratulations on the progress.

I heard back from the development team, and they say:

The property Rebar.NumberOfBarPositions will give us the number of bars in the set.

The Method Rebar.GetCenterlineCurves receives a barPositionIndex and will return the centreline curves for that bar.

I’m not sure what you mean by 'centre bar'; if in the set are 4 bars (indexes 0,1,2,3). It should be index 1 or 2?

  public IList<Curve> GetCenterlineCurves(
    bool adjustForSelfIntersection,
    bool suppressHooks,
    bool suppressBendRadius,
    MultiplanarOption multiplanarOption,
    int barPositionIndex)

What is missing in your code: GetCenterlineCurves will return the curves as they are positioned on the first bar.

You can obtain a transform which will move the curves into the desired position:

  RebarShapeDrivenAccessor accessor = rebar.GetShapeDrivenAccessor();
  Transform trf = accessor.GetBarPositionTransform(indice);
  // Now apply the trf on each curve obtained from calling GetCenterlineCurves()

I hope this helps.

Best regards,

Jeremy

Re: Get center bar of a Rebar Layout

Anonymous — Thu, 06 Jun 2019 19:40:40 GMT

Hi @jeremytammik ,

Following your indication I made exactly what I needed. Here is a snippet of the code II'm using so it may help some else in the future and the visual representation of what I achieved!

IList<Curve> curva_patron = barra.GetCenterlineCurves(
                                true,
                                true,
                                true,
                                MultiplanarOption.IncludeOnlyPlanarCurves,
                                Convert.ToInt32(indice));

                        // Se lleva la curva a la posicion central
                        RebarShapeDrivenAccessor accessor = barra.GetShapeDrivenAccessor();
                        Transform trf = accessor.GetBarPositionTransform(Convert.ToInt32(indice));

                        Curve curva_trans = curva_patron.First().CreateTransformed(trf);

                        DetailCurve dc = doc.Create.NewDetailCurve(
                            doc.ActiveView,
                            curva_trans);
                        dc.LineStyle = fe_losa;

Again, thanks a lot!

Regards.